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US20140069672A1 - Power Tool - Google Patents

Power Tool Download PDF

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Publication number
US20140069672A1
US20140069672A1 US14/118,035 US201214118035A US2014069672A1 US 20140069672 A1 US20140069672 A1 US 20140069672A1 US 201214118035 A US201214118035 A US 201214118035A US 2014069672 A1 US2014069672 A1 US 2014069672A1
Authority
US
United States
Prior art keywords
power tool
control
modes
control portion
overwriting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/118,035
Other languages
English (en)
Inventor
Hironori Mashiko
Nobuhiro Takano
Tomomasa Nishikawa
Atsushi Nakagawa
Masanori Watanabe
Mizuho Nakamura
Katsuhiro Oomori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2011113864A external-priority patent/JP5720890B2/ja
Priority claimed from JP2011113710A external-priority patent/JP2012240165A/ja
Application filed by Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Assigned to HITACHI KOKI CO., LTD. reassignment HITACHI KOKI CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MASHIKO, HIRONORI, NAKAGAWA, ATSUSHI, NAKAMURA, MIZUHO, NISHIKAWA, TOMOMASA, OOMORI, KATSUHIRO, TAKANO, NOBUHIRO, WATANABE, MASANORI
Publication of US20140069672A1 publication Critical patent/US20140069672A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • B25B23/1475—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers for impact wrenches or screwdrivers

Definitions

  • the present invention relates to a power tool, such as an electronic pulse driver, that performs operations based on control programs, and an overwriting system and method for overwriting the control programs used to control the power tool or parameters in the control programs.
  • a power tool such as an electronic pulse driver
  • the invention provides a power tool including: a motor configured to be driven based on one of a plurality of drive modes; a mode section switch; a control portion configured to operate responsive to a first operation to assign one or more drive modes preselected from the plurality of drive modes to the mode selection switch, a second operation different from the first operation being capable of manipulating the mode selection switch to select one drive mode from the one or more preselected drive modes, the control portion being further configured to control the motor based on the one drive mode selected by the mode selection switch.
  • the first operation is configured to be executed on an external device connected to the power tool.
  • a power tool including: a motor; a bit drive portion configured to be driven by the motor to drive a bit; a first storing portion configured to store a plurality of control modes for controlling the motor; and a control portion configured to control the motor.
  • the power tool further includes a second storing portion configured to store one or more control modes selected from the plurality of control modes as one or more drive modes.
  • the control portion is configured to control the motor based on one drive mode selected from the one or more drive modes stored in the second storing portion.
  • the power tool further including a connection portion configured to be connectable to an external device to conduct communication between the power tool and the external device.
  • the external device connected to the connection portion is configured to transmit one or more control modes selected from the plurality of control modes.
  • the second storing portion is configured to store the one or more control modes transmitted from the external device as the one or more drive modes.
  • a power tool including: a housing; a control portion accommodated in the housing; and a connection unit including a cable that is configured to be connectable to an external overwriting unit to conduct communication between the control portion and the external overwriting unit.
  • the connection unit is configured to connect the external overwriting unit with the control portion to execute both of power supply and signal transmission from the external overwriting unit to the control portion.
  • connection unit connected to the external overwriting unit includes two systems including a power supply system and a communication system.
  • the power supply system includes a USB cable.
  • the communication system includes an RS232C cable.
  • control portion includes an M16C/64 CPU.
  • connection unit includes a conversion portion including a transmission integrated circuit.
  • the transmission integrated circuit is a bus transceiver.
  • the conversion portion is provided outside the housing.
  • connection unit includes a single cable connecting the conversion portion with the control portion.
  • the single cable includes one signal line for the power supply and another signal line for the signal transmission.
  • the housing is provided with a communication connector.
  • the single cable is configured to be detachable with respect to the communication connector.
  • connection unit includes a cable connecting the conversion portion with the external overwriting unit.
  • the cable includes two systems including a power supply system and a communication system.
  • the connecting unit is configured to be detachable with respect to the housing.
  • an overwriting system including: a power tool including: a housing; and a control portion accommodated in the housing; a computer; and a connection unit configured to connect the power tool with the computer to conduct communication between the computer and the control portion.
  • the computer is configured to supply power to the control portion through the connection unit and to overwrite program used in the control portion or parameter in the program through the connection unit.
  • Another aspect of the present invention provides an overwriting method including:
  • connection unit connecting one end of a connection unit to a communication connector of a power tool including a control portion; connecting another end of the connection unit to a computer to conduct communication between the computer and the control portion; and supplying power from the computer to the control portion through the connection unit and overwriting program used in the control portion or parameter in the program through the connection unit.
  • the power tool can operate based solely on the control modes required by the user. Further, according to the power tool, the overwriting system, and the overwriting method, a power tool can overwrite control programs in the control unit or parameters used by the programs.
  • FIG. 1 is an external perspective view of an electronic pulse driver according to a first embodiment of the present invention
  • FIG. 2 is a cross-sectional view of the electronic pulse driver according to the first embodiment of the present invention.
  • FIG. 3 is a control block diagram of the electronic pulse driver according to the first embodiment of the present invention.
  • FIG. 4 is a diagram showing a state where a main body of the electronic pulse driver and a PC are connected with each other;
  • FIG. 5 is a flowchart illustrating steps in a process for changing drive modes according to the first embodiment of the present invention
  • FIG. 6 is a diagram showing a GUI window for changing drive modes according to the first embodiment of the present invention.
  • FIG. 7 shows an overall appearance of an electronic pulse driver and an overwriting system according to a second embodiment of the present invention
  • FIG. 8 is a block diagram illustrating the electrical structure of the overwriting system according to a second embodiment of the present invention.
  • FIG. 9 is a side view of an electronic pulse driver according to the second embodiment of the present invention.
  • FIG. 10 is a cross-sectional view of the electronic pulse driver according to the second embodiment of the present invention.
  • FIG. 11 is an enlarged perspective view of a connecting member of the electronic pulse driver according to the second embodiment of the present invention.
  • FIG. 12 is a block diagram illustrating the electrical structure of the overwriting system according to a modification to the second embodiment of the present invention.
  • the power tool according to the first embodiment is an electronic pulse driver 1 .
  • the electronic pulse driver 1 is configured of a main body 1 A, and a battery 24 .
  • the main body 1 A primarily includes a housing 2 , a motor 3 , a hammer unit 4 , an anvil unit 5 , an inverter circuit 6 , a control unit 7 , and rotational position sensors (Hall elements) 8 (see FIG. 3 ).
  • the housing 2 is formed of a resin material and constitutes the outer shell of the electronic pulse driver 1 .
  • the housing 2 is primarily configured of a substantially cylindrical body section 21 , and a handle section 22 extending from the body section 21 .
  • the motor 3 is disposed inside the body section 21 and is oriented with its axial direction running in the longitudinal direction of the body section 21 .
  • the hammer unit 4 and anvil unit 5 are juxtaposed and positioned to confront one axial end of the motor 3 .
  • the side in which the anvil unit 5 is disposed is defined as the front side of the electronic pulse driver 1 while the side possessing the motor 3 is defined as the rear side, and directions parallel to the axis of the motor 3 are defined as forward and rearward directions.
  • the body section 21 side of the electronic pulse driver 1 will be defined as the top side of the electronic pulse driver 1 , the handle section 22 side as the bottom side, and the vertical direction as the direction extending between the body section 21 and handle section 22 . Further, directions orthogonal to the forward and rearward directions and the upward and downward directions are defined as left and right directions.
  • a hammer case 23 is disposed at a forward position within the body section 21 for housing the hammer unit 4 and anvil unit 5 .
  • the hammer case 23 is formed of metal in a general funnel shape such that its diameter grows gradually narrower toward the front end.
  • An opening 23 a is formed in the front end of the hammer case 23 .
  • the hammer case 23 also has a metallic part 23 A provided on the inner wall thereof defining the opening 23 a.
  • the body section 21 is a plurality of intakes 21 a and outlets 21 b through which external air is drawn into and discharged from the body section 21 by a fan 32 described later.
  • the external air flowing through the body section 21 cools the motor 3 .
  • the inverter circuit 6 is also provided on the rear side of the motor 3 .
  • the handle section 22 is integrally configured with the body section 21 and extends downward from a position on the body section 21 in substantially the front-to-rear center thereof.
  • a battery connector 22 A is provided on the bottom end of the handle section 22 .
  • the battery 24 is detachably mounted on the battery connector 22 A and functions to supply power to the motor 3 and the like.
  • the battery 24 is a nickel-cadmium battery or a lithium-ion battery, for example.
  • a trigger 25 is provided in the top portion of the handle section 22 and is positioned on the front side thereof.
  • a toggle switch 30 ( FIG. 3 ) as a mode selection switch is provided in the bottom portion of the handle section 22 on the right side surface thereof and functions to switch the operating mode of the electronic pulse driver 1 among four drive modes described later.
  • a display unit (not shown) is also disposed near the toggle switch 30 for displaying the drive mode that is currently selected.
  • the motor 3 is a brushless motor primarily configured of a rotor 3 A including an output shaft 31 , and a stator 3 B disposed in confrontation with the rotor 3 A.
  • the motor 3 is arranged in the body section 21 so that the axis of the output shaft 31 is oriented in the front-to-rear direction.
  • the output shaft 31 protrudes from both front and rear ends of the rotor 3 A and is rotatably supported in the body section 21 at the protruding ends by bearings 33 a and 33 b.
  • a fan 32 is disposed on the portion of the output shaft 31 protruding forward from the rotor 3 A.
  • the fan 32 rotates integrally and coaxially with the output shaft 31 .
  • a pinion gear 31 A is provided on the forwardmost end of the portion of the output shaft 31 protruding forward from the rotor 3 A.
  • the pinion gear 31 A rotates integrally and coaxially with the output shaft 31 .
  • the hammer unit 4 is housed in the hammer case 23 on the front side of the motor 3 .
  • the hammer unit 4 primarily includes a gear mechanism 41 , and a hammer 42 .
  • the gear mechanism 41 includes a single outer gear 41 A, and two planetary gear mechanisms 41 B and 41 C that share the same outer gear 41 A.
  • the outer gear 41 A is housed in the hammer case 23 and fixed to the body section 21 .
  • the planetary gear mechanism 41 B is disposed in the outer gear 41 A and is engaged with the same.
  • the planetary gear mechanism 41 B uses the pinion gear 31 A as a sun gear.
  • the planetary gear mechanism 41 C is also disposed in the outer gear 41 A and is engaged with the same.
  • the planetary gear mechanism 41 C is positioned forward of the planetary gear mechanism 41 B and uses the output shaft of the planetary gear mechanism 41 B as a sun gear.
  • the hammer 42 is defined in the front surface of a planetary carrier constituting the planetary gear mechanism 41 C.
  • the hammer 42 includes a first engaging protrusion 42 A disposed at a position offset from the rotational center of the planet carrier and protruding forward, and a second engaging protrusion (not shown) disposed on the opposite side of the rotational center of the planet carrier from the first engaging protrusion 42 A.
  • the anvil unit 5 is disposed in front of the hammer unit 4 and primarily includes a tip tool mounting part 51 , and an anvil 52 .
  • the tip tool mounting part 51 is cylindrical in shape and rotatably supported in the opening 23 a of the hammer case 23 through the metallic part 23 A.
  • An insertion hole 51 a penetrates the tip tool mounting part 51 in the front-to-rear direction for receiving a bit (not shown) inserted therethrough.
  • a chuck 51 A is provided at the front end of the tip tool mounting part 51 for holding the bit.
  • the anvil 52 is disposed in the hammer case 23 on the rear side of the tip tool mounting part 51 and is integrally formed with the tip tool mounting part 51 .
  • the anvil 52 includes a first engagement protrusion 52 A and a second engagement protrusion 52 B respectively disposed on opposite sides of the rotational center of the tip tool mounting part 51 .
  • the engagement protrusions 52 A and 52 B protrude rearward from the anvil 52 .
  • the inverter circuit 6 includes six switching elements Q 1 -Q 6 configured of FETs or the like connected in a 3-phase bridge configuration.
  • the control unit 7 is mounted on a circuit board provided in the handle section 22 at a position near the battery 24 .
  • the control unit 7 is connected to the battery 24 , as well as the trigger 25 , the inverter circuit 6 , the toggle switch 30 , and the display unit (not shown). As shown in FIG.
  • the control unit 7 includes a current detection circuit 71 , a switch operation detection circuit 72 , an applied voltage setting circuit 73 , a rotating direction setting circuit 74 , a rotor position detection circuit 75 , a rotational angle detection circuit 76 , a temperature detection circuit 77 , a microcomputer 78 as a calculating section, a control signal output circuit 79 , a EEPROM 80 , and an external connection terminal (communication connector) 81 .
  • the external connection terminal 81 is provided on the portion of the handle section 22 that confronts the battery 24 and is exposed when the battery 24 is removed.
  • the external connection terminal 81 is connected to the microcomputer 78 in the main body 1 A, enabling an external device, such as a PC 82 (see FIG. 4 ), to connect to and communicate with the microcomputer 78 .
  • the external connection terminal 81 is any common connector, such as a Micro-USB connector.
  • the rotational position sensors 8 are disposed at positions facing permanent magnets 3 C in the rotor 3 A.
  • the rotational position sensors 8 are spaced at prescribed intervals along the circumferential direction of the rotor 3 A (every 60 degrees, for example).
  • the motor 3 is configured of a 3-phase brushless DC motor.
  • the rotor 3 A of this motor 3 is configured of a plurality (two in this embodiment) of the permanent magnets 3 C, each having an N-pole and an S-pole.
  • the stator 3 B is configured of 3-phase star-connected stator coils U, V, and W.
  • the gates of the switching elements Q 1 -Q 6 constituting the inverter circuit 6 are connected to the control signal output circuit 79 of the control unit 7 , while the drains or sources of the switching elements Q 1 -Q 6 are connected to the stator coils U, V, and W of the stator 3 B.
  • the switching elements Q 1 -Q 6 perform switching operations based on switching element drive signals inputted from the control signal output circuit 79 and supply power to the stator coils U, V, and W by converting the DC voltage of the battery 24 applied to the inverter circuit 6 to 3-phase (U-phase, V-phase, and W-phase) voltages Vu, Vv, and Vw.
  • output switching signals H 1 , H 2 , and H 3 inputted from the control signal output circuit 79 into the switching elements Q 1 -Q 3 on the positive power supply side of the inverter circuit 6 control to which of the stator coils U, V, and W power is supplied and, hence, the rotating direction of the rotor 3 A.
  • the pulse width modulation (PWM) signals H 4 , H 5 , and H 6 inputted from the control signal output circuit 79 into the switching elements Q 4 -Q 6 on the negative power supply side of the inverter circuit 6 control the amount of power supplied to the stator coils U, V, and W and, hence, the rotational speed of the rotor 3 A.
  • the current detection circuit 71 measures the current supplied to the motor 3 and outputs this value to the microcomputer 78 .
  • the switch operation detection circuit 72 detects whether the trigger 25 has been operated and outputs the results of this detection to the microcomputer 78 .
  • the applied voltage setting circuit 73 outputs a signal to the microcomputer 78 commensurate with the degree to which the trigger 25 was operated.
  • the electronic pulse driver 1 is also provided with a forward-reverse lever (not shown) for toggling the rotating direction of the motor 3 .
  • the rotating direction setting circuit 74 detects changes in the forward-reverse lever and transmits a signal to the microcomputer 78 to toggle the rotating direction of the motor 3 .
  • the rotor position detection circuit 75 detects the rotational position of the rotor 3 A based on signals received from the rotational position sensors 8 and outputs the detected position to the microcomputer 78 .
  • the rotational angle detection circuit 76 detects the angle of the rotor 3 A based on signals received from the rotational position sensors 8 .
  • the detection value of the rotational angle detection circuit 76 is used when performing control based on the rotational angle.
  • the temperature detection circuit 77 detects the temperature of the motor 3 .
  • the microcomputer 78 is configured to halt rotation of the motor 3 when the temperature of the motor 3 rises to a predetermined value.
  • the microcomputer 78 is configured of a central processing unit (CPU) for outputting a drive signal based on a program and control data, a ROM for storing the program and control data, a RAM for temporarily storing process data, and a timer.
  • the microcomputer 78 generates the output switching signals H 1 , H 2 , and H 3 based on signals outputted from the rotating direction setting circuit 74 and rotor position detection circuit 75 and generates the PWM signals H 4 , H 5 , and H 6 based on signals outputted from the applied voltage setting circuit 73 , and outputs these signals to the control signal output circuit 79 .
  • the microcomputer 78 may output the PWM signals to the switching elements Q 1 -Q 3 on the positive power supply side and may output the output switching signals to the switching elements Q 4 -Q 6 on the negative power supply side.
  • control modes for controlling the motor 3 are stored in the ROM of the microcomputer 78 .
  • Four of the twenty control modes stored in ROM are also stored in the EEPROM 80 as drive modes. More specifically, numbers are assigned to each of the twenty control modes stored in ROM, and the four numbers corresponding to four of the control modes are stored in the EEPROM 80 .
  • the drive mode currently selected by the toggle switch 30 is displayed on the display unit as the current drive mode.
  • the CPU of the microcomputer 78 reads the control mode corresponding to the selected drive mode from ROM in order to control the motor 3 .
  • the electronic pulse driver 1 includes a drill mode, clutch modes 1 - 10 , torque control modes 1 - 5 , and pulse modes 1 - 4 , for a total of twenty control modes.
  • the hammer 42 and anvil 52 are rotated as a unit. Therefore, this mode is primarily used for tightening wood screws and the like.
  • the microcomputer 78 increases the supply of electric current to the motor 3 as the screw becomes tighter.
  • the clutch mode In the clutch mode, the current supplied to the motor 3 is gradually increased while the hammer 42 and anvil 52 are rotated together, and the microcomputer 78 halts driving of the motor 3 when the current reaches a target value (target torque).
  • target torque a target value
  • the clutch mode is primarily used when emphasizing a proper tightening torque, such as when tightening cosmetic fasteners or the like that remain visible on the exterior of the workpiece after the fastening operation. In this, ten clutch modes are provided for various tightening forces (target torque values).
  • the electric current supplied to the motor 3 is gradually increased while the hammer 42 and anvil 52 are rotated together, and when the current reaches a prescribed value (prescribed torque), the microcomputer 78 will begin an impact operation by alternating between forward and reverse rotation of the motor 3 .
  • the microcomputer 78 stops driving the motor 3 after a prescribed number of impacts.
  • the torque control mode is used when a higher torque than that delivered in the clutch mode is required for tightening the fasteners or the like.
  • the electronic pulse driver 1 according to this embodiment is provided with five torque control modes.
  • the pulse mode the electric current supplied to the motor 3 is gradually increased while the hammer 42 and anvil 52 are rotated together. After the electric current has risen to a prescribed value (prescribed torque), the microcomputer 78 begins producing impacts to tighten the fastener by alternating the motor 3 between the forward and reverse directions.
  • the pulse mode is mainly used when tightening long screws in areas of a workpiece that will not be outwardly visible. This mode can simultaneously supply a strong tightening force while reducing the reaction force from the workpiece.
  • the electronic pulse driver 1 is provided with four pulse modes corresponding to various tightening forces (prescribed torque values).
  • the user removes the battery 24 from the electronic pulse driver 1 and connects the main body 1 A to the PC 82 using a USB cable 83 , as illustrated in FIG. 4 .
  • the USB cable 83 is connected to the external connection terminal 81 .
  • the USB cable 83 enables the PC 82 to supply electricity to the main body 1 A.
  • the PC 82 includes a computer case 82 A provided with a CPU, a ROM, a RAM, and the like; and a display 82 B.
  • An application program for setting drive modes is pre-stored in the ROM of the PC 82 .
  • the user After connecting the main body 1 A to the PC 82 , the user launches the application program stored in the PC 82 .
  • the CPU of the PC 82 (hereinafter “the CPU of the PC 82 ” will be abbreviated as “the PC 82 ”) transmits a request to the main body 1 A for model data and parameters for electronic pulse driver 1 .
  • the model data is the model name of the electronic pulse driver 1 and is stored in the ROM of the microcomputer 78 , while the parameters indicate the four drive modes stored in the EEPROM 80 .
  • the CPU of the main body 1 A (hereinafter “the CPU of the main body 1 A” will be abbreviated as “the main body 1 A”) continually monitors the connection with the PC 82 after the connection has been established to determine whether a request was received.
  • the main body 1 A determines that a request has been received from the PC 82 (S 2 : YES)
  • the main body 1 A transmits the model data and parameters to the PC 82 .
  • the main body 1 A continually monitors the connection while a request has not been received (S 2 : NO).
  • the PC 82 determines whether model data and parameters have been returned from the main body 1 A. If the data has been returned (S 4 : YES), in S 5 the PC 82 transmits an acknowledgment (ACK) to the main body 1 A and stores the received model data in RAM. If the PC 82 has not received a response within the prescribed time (S 4 : NO), in S 6 the PC 82 performs a communication error process and returns to S 1 .
  • the process in S 6 may involve incrementing the number of transmission failures that have occurred, for example. If the number of transmission failures reaches a prescribed number, the PC 82 may issue an error notification to the user indicating that the transmission failed.
  • the main body 1 A determines whether an acknowledgment was received from the PC 82 . If no acknowledgment was received (S 7 : NO), in S 8 the main body 1 A performs a transmission error process similar to the process performed by the PC 82 in S 6 and returns to S 2 . In addition to the performing the transmission error process in S 8 , the main body 1 A also transmits a message to the PC 82 requesting that the process be repeated from S 1 .
  • the PC 82 After the PC 82 transmits an acknowledgment in S 5 and when a message is not received from the main body 1 A indicating a transmission error, in S 9 the PC 82 displays a graphical user interface (GUI) window (setting window) 90 on the PC 82 .
  • GUI graphical user interface
  • the GUI window 90 has a model name display area 91 , a control mode list display area 92 , a send mode display area 93 , a select button 94 , a send button 95 , and a reset button 96 .
  • the model name and other data on the electronic pulse driver 1 is displayed in the model name display area 91 based on the received model data.
  • a list of the twenty control modes possessed by the electronic pulse driver 1 is displayed in the control mode list display area 92 based on the same model data.
  • the current control modes of the electronic pulse driver 1 (drive modes) are displayed in the send mode display area 93 based on the received parameters.
  • the user can select one of the four control modes displayed in the send mode display area 93 and delete the selected mode by clicking the reset button 96 .
  • the user can select one of the control modes in the list of twenty control modes displayed in the control mode list display area 92 and click on the select button 94 to display the selected control mode in the send mode display area 93 .
  • the user can select four control modes to be displayed in the send mode display area 93 .
  • the numbers assigned to these four control modes are transmitted to the main body 1 A as the parameters.
  • This drive mode selection process corresponds to a first operation.
  • the PC 82 determines whether four control modes (parameters) have been specified. That is, the PC 82 determines whether the user has clicked on the send button 95 . While the user has not clicked on the send button 95 (S 11 : NO), the PC 82 repeatedly loops between the processes in S 10 and S 11 . When the user clicks on the send button 95 and the PC 82 determines that the parameters have been specified (S 11 : YES), in S 12 the PC 82 sends the parameters to the main body 1 A. The PC 82 also stores the transmitted parameters in RAM in association with the model data received from the main body 1 A.
  • the main body 1 A determines whether parameters have been received from the PC 82 .
  • the main body 1 A overwrites the parameters currently stored in the EEPROM 80 with the new parameters received from the PC 82 .
  • the main body 1 A has not received the parameters (S 13 : NO), the main body 1 A repeats determination of S 13 .
  • the PC 82 After the PC 82 transmits the parameters in S 12 , in S 15 the PC 82 again transmits a request to the main body 1 A for model data and parameters. After writing the parameters to the EEPROM 80 in S 14 , in S 16 the main body 1 A determines whether a request has been received from the PC 82 . If a request was received from the PC 82 (S 16 : YES), in S 17 the main body 1 A transmits the model data and parameters to the PC 82 . In the meantime, after transmitting the request in S 15 , in S 18 the PC 82 determines whether the main body 1 A has returned the model data and parameters.
  • S 20 determines whether the model data and parameters received from the main body 1 A match the model data and parameters stored in the RAM of the comput Ser case 82 A. If the data matches (S 20 : YES), in S 21 the PC 82 displays a message on the display 82 B indicating that the parameters (drive modes) have been successfully modified, and subsequently ends the process in FIG. 5 . However, if the data does not match (S 20 : NO), the PC 82 performs the process in S 19 described above and subsequently returns to S 10 .
  • the four control modes selected by the user are stored in the EEPROM 80 of the electronic pulse driver 1 as the drive modes.
  • the four control modes are assigned to the toggle switch 30 as the drive modes.
  • one drive mode of the four drive modes is selected by manipulating the toggle switch 30 .
  • the electronic pulse driver 1 is driven based on the one selected drive mode currently selected by the toggle switch 30 .
  • This drive mode selection process corresponds to a second operation.
  • the user can operate the electronic pulse driver 1 according to control modes that the user has selected.
  • this embodiment provides an electronic pulse driver 1 that meets the user's needs.
  • these drive modes can be changed by connecting the main body 1 A to the PC 82 , as described above.
  • a compact power tool can be provided.
  • the overwriting system 100 functions to overwrite control programs or the like.
  • FIG. 7 shows the overall appearance of the overwriting system 100
  • FIG. 8 is a block diagram illustrating the electrical structure of the overwriting system 100 .
  • the battery 24 functioning as the drive source of a power tool 201 has been removed therefrom.
  • program parameters denote variables that can affect the operations of the control programs, for example, and the term “control programs or the like” will be used to mean “control programs or program parameters. ”
  • the overwriting system 100 for overwriting control programs or the like includes the power tool 201 , a computer 103 , a power cable 104 , a communication cable 105 , a conversion device 106 , and a dedicated cable 108 .
  • the power tool 201 according to this embodiment will be described with reference to FIGS. 9 and 10 , where parts and components similar to the electronic pulse driver 1 of the first embodiment are designated with the same reference numerals to avoid duplicating description.
  • a switching board 26 is provided beneath the trigger switch 25 .
  • the switching board 26 is connected to the control unit 7 via a switch flat cable 27 A.
  • the switch flat cable 27 A is configured of eighteen flexible printed circuits (FPC), for example.
  • the control unit 7 is connected to the inverter circuit 6 via a motor flat cable 27 B.
  • the motor flat cable 27 B is similarly configured of FPCs.
  • the control unit 7 is also provided with a terminal 7 A in contact with the plus and minus electrodes of the battery 24 .
  • One end of a power line 28 is connected to the terminal 7 A, while the other end is a connected to the switching board 26 .
  • the power line 28 is provided with one positive and one negative wire.
  • the battery 24 of this embodiment is substantially L-shaped in a side view.
  • the battery 24 extends into and is accommodated in the lower end of the handle section 22 .
  • Release buttons 24 A are provided one on each of the left and right sides of the battery 24 . By pressing both of the left and right release buttons 24 A inward while pulling downward on the battery 24 , an operator can remove the battery 24 from the battery connector 22 A.
  • a connecting member 29 having the external connection terminal (communication connector) 81 (see also FIG. 11 ) is fixed to the battery connector 22 A with screws or the like.
  • the microcomputer 78 of this embodiment also possesses an M16C/64 CPU.
  • the computer 103 is a common computer, such as a personal computer.
  • the power cable 104 is a USB cable, for example. One end of the power cable 104 is connected to a USB port of the computer 103 , while the other end is connected to a USB connector on the conversion device 106 .
  • the communication cable 105 is an RS232C (Recommended Standard) cable, for example. One end of the communication cable 105 is connected to an RS232C port of the computer 103 , while the other end is connected to an RS232C connector of the conversion device 106 .
  • the conversion device 106 converts between the RS232C signal level and the signal level of the micro-computer 78 .
  • the conversion device 106 is provided with a transmission integrated circuit such as a bus transceiver (the MAX3221EAE in this embodiment).
  • a transmission integrated circuit such as a bus transceiver (the MAX3221EAE in this embodiment).
  • One end of the dedicated cable 108 is connected to the conversion device 106 (fixedly integrated, for example), while the other end is connected to the external connection terminal 81 of the power tool 201 .
  • the dedicated cable 108 is provided with four signal lines for reception (connected to the RD pin), power (connected to the Vcc pin), transmission (connected to the TD pin), and ground (connected to the GND pin).
  • the computer 103 can overwrite the control programs or the like written in the ROM of the microcomputer 78 . Since the battery is removed from the power tool 201 , the computer 103 supplies power to the microcomputer 78 (5V, for example) through the power cable 104 , conversion device 106 , dedicated cable 108 , and the external connection terminal 81 . The computer 103 transmits signals for overwriting programs in the microcomputer 78 via the communication cable 105 , conversion device 106 , dedicated cable 108 , and the external connection terminal 81 .
  • one side of the cable connecting the computer 103 and the power tool 201 is constructed from includes two systems including a power supply system (the power cable 104 ) and a communication system (the communication cable 105 ).
  • the overwriting system 100 can obtain the following effects.
  • Control programs or the like stored in the microcomputer 78 built into the housing 2 or a memory element provided with or built into the microcomputer 78 can be overwritten at a later date with programs and the like adapted to the customer's needs.
  • this system provides a versatile power tool that can satisfy the needs of individual customers.
  • the overwriting system 100 enables the computer 103 to transmit overwriting signals together with a power supply to the microcomputer 78 while the battery is removed from the body of the power tool 201 , preventing the power tool 201 from being operated. Accordingly, the overwriting system 100 allows for the safe overwriting of control programs or the like in the microcomputer 78 .
  • the CPU provided in the microcomputer 78 is the inexpensive M16C/64, making it possible to provide the power tool at a lower cost.
  • this configuration reduces the number of parts that are added to the power tool 201 for overwriting control programs or the like in the microcomputer 78 .
  • this configuration is more cost-efficient than if the conversion device 106 were fixedly disposed inside the housing.
  • the computer 103 can supply power (5V) through the USB cable, there is no need to provide an adapter or other power supply circuit, but merely to provide a single dedicated cable, thereby making this configuration advantageous for reducing the number of parts and cost and increasing productivity. Further, a 5V power supply is very stable since it is universally used.
  • control modes are stored in the EEPROM 80 as drive modes, but the number of drive modes is not limited to four. Further, the drive modes are stored in the EEPROM 80 as numbers corresponding to these control modes, but the control modes themselves may be stored as the drive modes.
  • the dedicated cable 108 described in the second embodiment may possess five signal lines rather than four.
  • the number of signal lines should be set based on the number of pins in the external connection terminal 81 .
  • the block diagram in FIG. 12 illustrates an overwriting system for overwriting control programs or the like when the dedicated cable 108 possesses five signal lines.
  • the configuration of the embodiments may be implemented using a USB-RS232C converter.
  • USB cable may be used as the communication cable.
  • a single USB cable can be used to function as both the power cable and the communication cable.
  • a USB connector for the power supply may be provided separately from the external connection terminal 81 , dividing the connecting means between two systems (a power supply system and a communication system) on the power tool 201 side.
  • the above embodiment may be applied to a wide variety of power tools and is not limited to fasteners and other power drivers, provided that operations are performed based on programs in a control unit.
  • the four drive modes are selected on the PC 82 .
  • the four drive modes may be selected on the main body 1 A.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Control Of Ac Motors In General (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
US14/118,035 2011-05-20 2012-03-21 Power Tool Abandoned US20140069672A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2011-113710 2011-05-20
JP2011113864A JP5720890B2 (ja) 2011-05-20 2011-05-20 電動工具
JP2011113710A JP2012240165A (ja) 2011-05-20 2011-05-20 電動工具
JP2011-113864 2011-05-20
PCT/JP2012/003305 WO2012160799A2 (fr) 2011-05-20 2012-05-21 Outil électrique

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US20140069672A1 true US20140069672A1 (en) 2014-03-13

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EP (1) EP2712338A2 (fr)
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WO (1) WO2012160799A2 (fr)

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WO2012160799A2 (fr) 2012-11-29
WO2012160799A3 (fr) 2013-02-21
EP2712338A2 (fr) 2014-04-02
CN103547415A (zh) 2014-01-29

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